The amount of performance and technology built into the Oakley Fast Jacket XL Polarized Sunglasses is incredible. The features on these babies are never-ending. From the O Matter frames that are stress-resistant and durable to the Plutonite Lenses that are interchangeable, the possibilities are endless. The frames boast a feature called Switchlock Interchangeable Technology. By utilizing a simple switchlock mechanism, you can change your lenses to accommodate different light conditions. Unobtanium Earsocks and nosebombs ensure that these sunglasses have a strong grip which only increases as you're sweating. Precise optical alignment for comfort and performance is due to the frames' Three-Point Fit. Let's talk about the lenses. From polarization for minimal glare to its 8.75 Base Lens Curvature for maximum peripheral vision and side protection, you'll see it all and keep your eyes protected. These lenses meet the standards for high velocity and high mass impact resistance so whatever you're doing, your eyes will be well-protected. Plutonite on the lenses ensures that 100% of the harmful light and rays of the sun are filtered out. When it comes to expecting the very best in design and function, you know Oakley is at the top of the game. Wear the best when you head out. Wear the Oakley Fast Jacket XL Polarized Sunglasses.